lkml.org 
[lkml]   [2005]   [Mar]   [21]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
Date
From
SubjectRe: 2.6.11: iostat values broken ?
On Mon, 21 Mar 2005 23:09:42, Andrew Morton wrote:
> "Miquel van Smoorenburg" <miquels@cistron.nl> wrote:
> >
> > I just upgrades one of our newsservers from 2.6.9 to 2.6.11. I
> > use "iostat -k -x 2" to see live how busy the disks are. But
> > I don't believe that Linux optimizes things so much that a disk
> > can be 1849.55% busy :)
> >
> > (you'll have to stretch out your xterm to be able to read this):
> >
> > Device: rrqm/s wrqm/s r/s w/s rsec/s wsec/s rkB/s wkB/s avgrq-sz avgqu-sz await svctm %util
> > hda 0.00 50.00 0.00 18.18 0.00 545.45 0.00 272.73 30.00 2.35 129.00 86.25 156.82
> > hdc 0.00 45.45 77.27 31.82 3927.27 618.18 1963.64 309.09 41.67 6.27 57.42 38.42 419.09
> > hdd 4.55 0.00 63.64 0.00 68.18 0.00 34.09 0.00 1.07 1.11 17.43 17.43 110.91
> > hde 477.27 0.00 45.45 0.00 522.73 0.00 261.36 0.00 11.50 0.40 8.90 8.90 40.45
> > hdg 18.18 70154.55 22.73 172.73 40.91 70727.27 20.45 35363.64 362.07 1010.36 1127.72 94.63 1849.55
> >
> > With 2.6.9, %util never came above 100% (and that was indeed "fully loaded".
> > I have systems with a comparable load running 2.6.10 and 2.6.11-rc3-bk4
> > that also don't show this behaviour (but those are SCSI, not IDE).
> >
> > I use CFQ, but changing that to deadline doesn't make a difference.
> >
>
> Mike, did you ever get to the bottom of this? Still happening in 2.6.12-rc1?

Sortof... (I already posted this before:) the siimage.c driver was broken for me with
2.6.11. Lots of IDE warning messages to /dev/console @ 9600 baud also makes
things slow and weird. I couldn't find what caused this, though, there
weren't much (if any) changes in siimage.c so it must have been something
different. Perhaps the IRQ changes.

I moved to sata_sil.c and everything now works fine. I tried sata_sil around 2.6.5
or so, and it was very unstable, but I was pleasantly surprised to see that
the new SATA code has come a long way.

So I still don't know what the _actual_ problem was, but the solution is
"use libata instead of the old IDE driver". As "make menuconfig" tells you
something similar it's probably an acceptable solution.

Mike.

-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@vger.kernel.org
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/

\
 
 \ /
  Last update: 2005-03-22 14:11    [W:0.142 / U:0.028 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site